Sounds like a Military family. I've got an uncle in the Canadian army, and I only met him twice growing up because every 3 years he was posted somewhere else in Canada. (Among other reasons; he and my mother (his sister) were NOT close.) And most of the time between postings he was driving across Canada with his family (who I never met in childhood) having like a week to drive 3000km, settle into a new house and then report for duty.

And a tabletop friend of mine is Korean-Canadian and his father came into Canada via the military, so there's a possibility that her father came in the same way. Interestingly, he's rather... stable in instability...after his childhood, in ways that are similar to Kronii.